Alexei Sinev graduated from the P.I. Tchaikovsky Moscow State Conservatory in 1995 (Professor Lev Rakov's class). In 1991-1993, he was a soloist of the orchestra of the N.I. Satz Moscow State Academic Music Theater for Children. In 1995-2003 he worked in the Svetlanov State Orchestra and toured with it in Europe, the USA, South America, Japan,

At present, he is an artist of the National Philharmonic Orchestra of Russia and teaches at the Russian State Academy of Arts. In 2025, he was awarded the Parental Glory Medal.